Acquisitions	6 Months Ended
Jun. 30, 2014
Business Combinations [Abstract]
Acquisitions	Acquisitions Acquisition of Alterra On May 1, 2013, the Company completed the acquisition of 100% of the issued and outstanding common stock of Alterra. Results attributable to Alterra's property and casualty insurance and reinsurance business are included in each of the Company's underwriting segments, which were redefined during the first quarter of 2014. See note 6. Previously, Alterra also offered life and annuity reinsurance products. In 2010, Alterra ceased writing life and annuity reinsurance contracts and placed this business into run-off. Results attributable to the run-off of Alterra's life and annuity reinsurance business are included in the Company's Other Insurance (Discontinued Lines) segment. See note 6 for further discussion of the Company's reportable segments. Pursuant to the terms of the Merger Agreement, on the Acquisition Date, equity holders of Alterra received, in exchange for each share of Alterra common stock held (other than restricted shares that did not vest in connection with the transaction), (1) 0.04315 shares of the Company's common stock and (2) $10.00 in cash. Equity holders of Alterra received total consideration of $3.3 billion, consisting of cash consideration of $964.3 million and stock consideration of 4.3 million shares of the Company's common stock. The purchase price was allocated to the acquired assets and liabilities of Alterra based on estimated fair values at the Acquisition Date. The Company recognized goodwill of $295.7 million, of which $107.8 million is included in the U.S. Insurance segment, $89.8 million is included in the International Insurance segment and $98.1 million is included in the Reinsurance segment. None of the goodwill that was recorded is deductible for income tax purposes. The Company also recognized indefinite lived intangible assets of $37.5 million and other intangible assets of $170.0 million, which are being amortized over a weighted average period of 17 years. Acquisition of Abbey Protection On January 17, 2014, the Company completed its acquisition of 100% of the share capital of Abbey Protection plc (Abbey), an integrated specialty insurance and consultancy group headquartered in London. Abbey's business is focused on the underwriting and sale of insurance products to small and medium-sized enterprises and affinity groups in the United Kingdom providing protection against legal expenses and professional fees incurred as a result of legal actions or investigations by tax authorities, as well as providing a range of complementary legal and professional consulting services. Premiums associated with Abbey's insurance operations for 2013 were in excess of $60 million. Results attributable to Abbey's insurance operations are included in the International Insurance segment. Results attributable to Abbey's consultancy operations are reported with the Company's non-insurance operations, which are not included in a reportable segment. Total consideration for this acquisition was $190.7 million, all of which was cash consideration. The purchase price was allocated to the acquired assets and liabilities based on estimated fair values on January 17, 2014. The Company recognized goodwill of $52.8 million, of which $37.5 million was allocated to the International Insurance segment and $15.3 million was allocated to the Company's non-insurance operations. None of the goodwill recognized is expected to be deductible for income tax purposes. The goodwill is primarily attributable to Abbey's assembled workforce and synergies that are expected to result upon integration of Abbey into the Company's insurance operations. The Company also recognized other intangible assets of $130.6 million, including $119.9 million of customer relationships and $10.7 million of trade names. These intangible assets are expected to be amortized over 20 years and 14 years, respectively. Acquisition of Cottrell On July 23, 2014, the Company acquired 100% of the outstanding shares of Cottrell, Inc. (Cottrell), a privately held company headquartered in Gainesville, Georgia. Cottrell is a leading manufacturer of over-the-road car hauler equipment and related car hauler parts. Total consideration for the acquisition of Cottrell included cash consideration of $130.0 million. Pursuant to the terms of the stock purchase agreement, we may also be required to pay additional consideration based on Cottrell's earnings, as defined in the stock purchase agreement, in 2014 and 2015. The purchase price allocation for Cottrell and the related calculation of estimated additional consideration to be paid will be performed in the third quarter of 2014. Results attributable to Cottrell will be included with the Company's non-insurance operations, which are not included in a reportable segment.

Acquisitions

Acquisition of Alterra

On May 1, 2013, the Company completed the acquisition of 100% of the issued and outstanding common stock of Alterra. Results attributable to Alterra's property and casualty insurance and reinsurance business are included in each of the Company's underwriting segments, which were redefined during the first quarter of 2014. See note 6. Previously, Alterra also offered life and annuity reinsurance products. In 2010, Alterra ceased writing life and annuity reinsurance contracts and placed this business into run-off. Results attributable to the run-off of Alterra's life and annuity reinsurance business are included in the Company's Other Insurance (Discontinued Lines) segment. See note 6 for further discussion of the Company's reportable segments.

Pursuant to the terms of the Merger Agreement, on the Acquisition Date, equity holders of Alterra received, in exchange for each share of Alterra common stock held (other than restricted shares that did not vest in connection with the transaction), (1) 0.04315 shares of the Company's common stock and (2) $10.00 in cash. Equity holders of Alterra received total consideration of $3.3 billion, consisting of cash consideration of $964.3 million and stock consideration of 4.3 million shares of the Company's common stock.

The purchase price was allocated to the acquired assets and liabilities of Alterra based on estimated fair values at the Acquisition Date. The Company recognized goodwill of $295.7 million, of which $107.8 million is included in the U.S. Insurance segment, $89.8 million is included in the International Insurance segment and $98.1 million is included in the Reinsurance segment. None of the goodwill that was recorded is deductible for income tax purposes. The Company also recognized indefinite lived intangible assets of $37.5 million and other intangible assets of $170.0 million, which are being amortized over a weighted average period of 17 years.

Acquisition of Abbey Protection

On January 17, 2014, the Company completed its acquisition of 100% of the share capital of Abbey Protection plc (Abbey), an integrated specialty insurance and consultancy group headquartered in London. Abbey's business is focused on the underwriting and sale of insurance products to small and medium-sized enterprises and affinity groups in the United Kingdom providing protection against legal expenses and professional fees incurred as a result of legal actions or investigations by tax authorities, as well as providing a range of complementary legal and professional consulting services. Premiums associated with Abbey's insurance operations for 2013 were in excess of $60 million. Results attributable to Abbey's insurance operations are included in the International Insurance segment. Results attributable to Abbey's consultancy operations are reported with the Company's non-insurance operations, which are not included in a reportable segment.

Total consideration for this acquisition was $190.7 million, all of which was cash consideration. The purchase price was allocated to the acquired assets and liabilities based on estimated fair values on January 17, 2014. The Company recognized goodwill of $52.8 million, of which $37.5 million was allocated to the International Insurance segment and $15.3 million was allocated to the Company's non-insurance operations. None of the goodwill recognized is expected to be deductible for income tax purposes. The goodwill is primarily attributable to Abbey's assembled workforce and synergies that are expected to result upon integration of Abbey into the Company's insurance operations. The Company also recognized other intangible assets of $130.6 million, including $119.9 million of customer relationships and $10.7 million of trade names. These intangible assets are expected to be amortized over 20 years and 14 years, respectively.

Acquisition of Cottrell

On July 23, 2014, the Company acquired 100% of the outstanding shares of Cottrell, Inc. (Cottrell), a privately held company headquartered in Gainesville, Georgia. Cottrell is a leading manufacturer of over-the-road car hauler equipment and related car hauler parts. Total consideration for the acquisition of Cottrell included cash consideration of $130.0 million. Pursuant to the terms of the stock purchase agreement, we may also be required to pay additional consideration based on Cottrell's earnings, as defined in the stock purchase agreement, in 2014 and 2015. The purchase price allocation for Cottrell and the related calculation of estimated additional consideration to be paid will be performed in the third quarter of 2014. Results attributable to Cottrell will be included with the Company's non-insurance operations, which are not included in a reportable segment.